Longines · Conquest

Strap for Conquest 29.5 Quartz Stainless Steel

Takes 15 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width15 mm
Case diameter30 mm
ReferenceL3.258.4.56.6 (aka: L32584566)
FamilyConquest
MovementLongines caliber L250 Hours, Minutes, Seconds | Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

The Conquest L3.258.4.56.6 (aka: L32584566), seen from the bench

The Conquest represents one of Longines' sports lines, equipped with the L250 caliber that offers indication of hours, minutes, seconds and date. The model with reference L3.258.4.56.6 has 15mm lugs. The collection is characterized by its positioning in the brand's sports watch segment.

Frequently asked questions

What is the lug width of the Longines Conquest L3.258.4.56.6?

The lug width of the Longines Conquest L3.258.4.56.6 is 15mm. This dimension is specific to this compact 29.50mm model. To verify, measure the free space between the two case lugs using a digital calliper, positioned perpendicularly over the lug.

Which strap do you recommend for the Longines Conquest L3.258.4.56.6?

For the Longines Conquest L3.258.4.56.6 29.50mm stainless steel, we recommend straps in vegetable-tanned alligator (elegance with longevity), full-grain calf leather with structured finish in neutral tones (brown, burgundy), or NATO in organic cotton for practicality. Avoid shell cordovan due to possible geometric incompatibility with the 15mm lug. Always pair with brushed stainless steel deployante.

How do I change the strap on my Longines Conquest?

To change the strap: 1) Position the watch on a soft surface; 2) Locate the lugs at the case ends (one per side); 3) Use a spring bar tool to press the lug from the opposite side and extract the old strap; 4) Insert the new 15mm strap into the lugs, gradually releasing tool pressure. Verify the strap adheres uniformly without play.

Can I use an aftermarket strap compatible with the Longines Conquest L3.258.4.56.6?

Yes, you can use certified quality aftermarket straps with exactly 15mm lug width. Milano Straps offers artisanal compatible straps ready for shipment, customisable in sizes and finishes. For optimal results, choose specialised suppliers guaranteeing precise tolerances on this less common dimension.

How long does a leather strap last on the Longines Conquest?

A high-quality leather strap (vegetable-tanned alligator, full-grain calf) lasts 3-5 years with regular use and proper maintenance: protect from prolonged moisture, apply natural conditioner every 6 months, air-dry. Shell cordovan and alligator reach 5-7 years. Casati Milano's artisanal warranty covers 18 months against manufacturing defects.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only